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Finding the Fourth Proportional to 921, 1,381.18 and 343.56

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Solution

The fourth proportional to 921, 1,381.18 and 343.56 is: 515.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    921 : 1,381.18 = 343.56 : x
  2. Step 2: Convert to fraction form
    921/1,381.18 = 343.56/x
  3. Step 3: Cross multiply
    921x = 1,381.18 × 343.56
  4. Step 4: Simplify right side
    921x = 474,518.20
  5. Step 5: Solve for x
    x = 474,518.20/921
  6. Step 6: Final answer
    x = 515.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.